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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Severe acute respiratory syndrome coronavirus elicits a weak interferon response compared to traditional interferon-inducing viruses.
Intervirology 2008
The aim of the present study is to investigate changes of interferon (IFN) production occurring over the first 48 h after infection of peripheral blood mononuclear cells (PBMCs) with severe acute respiratory syndrome (SARS) coronavirus (CoV) and to compare these changes to those induced by well-established IFN-inducing viruses, such as vesicular stomatitis (VSV) and Newcastle viruses (NDV). Experiments have been carried out using PBMCs of 10 different healthy donors. The results showed that the antiviral activity of IFN contained in the supernatant of SARS-CoV-infected PBMCs was lower than those induced by VSV and NDV. Consequently, SARS-CoV induces a lower synthesis of IFN-alpha, -beta and -gamma compared to VSV and NDV. Characterization of the profile of IFN-alpha subtypes genes expression in SARS-CoV-infected PBMCs demonstrated that the level of IFN-alpha2 and -6 subtypes were higher compared to other IFN-alpha subtypes namely, IFN-alpha5, -8, -10, -13/1, -17, and -21. In conclusion, SARS-CoV induces IFNs to a less extent compared to VSV and NDV, thus suggesting that the IFN system does play a limited role in early host defense against SARS-CoV infection.
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